May, 1938] 



Experiments With Grass Hay 



1& 



The data in Table XII show slightly better utilization of the nitrogen 

 in the small application. Nitrogen recovery and protein percentage 

 for these plots are given in Table XIII. 



Table XIII. Nitrogen recoveries and protein percentages resulting from the 

 use of different amounts of nitrate of soda on the Mathes farm plots. 



Nitrogen at Different Dates 



Nitrogen has been applied at different dates in April to determine- 

 whether there is any appreciable variation in response. Nitrate of soda 

 was used in this test and 200-pound applications were made April 5, 

 April 15, and April 25. The data (Table XIV) do not indicate any 

 significant differences in yield for the different dates but they do indi- 

 cate progressively greater recovery of nitrogen for the later applica- 

 tions. 



Table XIV. Nitrate of soda applied to Mathes farm plots on different dates. 



In another test on the Weld farm, plots which had uniform nitrogen 

 applications at different dates have been harvested for a six-year period. 

 The data in Table XV support that which is presented in Table XIV, 

 indicating slightly greater growth stimulation and nitrogen recovery 

 at the later date. These tests have both been conducted with readily 

 soluble nitrate of soda, a substance that is easily leached, and for this 

 reason its application before the roots are in an active condition is not tO' 

 be recommended. 



In another series of plots adjoining those presented in Table XV, the 

 nitrogen application was delayed until after the first harvest which was 

 made annually on June 10. All plots were thus harvested in June and 

 again in September, the idea being to determine whether the June ap- 

 plication of nitrogen would greatly stimulate the second cutting. 



